changing header height in Modularity-lite

Please Help,
I followed the instructions in a previouse forum post on changing the header height for modularity-lite. Created a new functions php folder in my child theme then entered this code in the editor
<?php
define(‘HEADER_IMAGE_WIDTH’, 950);
define(‘HEADER_IMAGE_HEIGHT’, 400);
function my_header_height($size){
return 110;
}
function my_header_width($size){
return 350;
}
?>
Saved the changes. Went in to change header and my new pixel height showed up under picture size. Uploaded picture, asked me to crop with my new specs. The image sample is the corrected new height Then saved
Went to site and the height did not change but the picture stretched out.
Default pixel height was 950 wide / 200 tall

If anyone knows where I went wrong or what else I need to do I’d like to know
Thanks